Yes
Rogers departure. Intel.
>once we have it all
Sessions departure. Law.
>once all the legal prep was in place
Kelly departure. Warfare/MIL
>once all the domestic house was clean
Mattis departure. Warfare/MIL
>once the internal theatre was clean
Notice a pattern?
Everyone leaves once they are finished and moves into another role.
None of these other roles are public yet but they sure as shit are not retiring.